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16 <br /> hollow stem of the augers to provide a uniform filter pack around the cas- <br /> ing and to stabilize the borehole. The sand pack will be placed to a maxi- <br /> mum of 2 feet above the screens followed by a minimum 1-foot seal con- <br /> sisting of bentonite pellets. <br /> Cement grout containing 5 percent bentonite or concrete will be placed <br /> above the bentonite seal to the ground surface. A concrete traffic-rated <br />' vault box will be installed over the monitoring well(s). A watertight locking <br /> cap will be installed over the top of the well casing. Reference elevations <br /> for each monitoring well will be surveyed when more than two wells will be <br /> located on site. Monitoring well elevations will be surveyed by EMCON <br /> Associates or a subcontractor to the nearest 0.01 foot relative to mean sea <br />' level or a site datum. <br /> Exploratory boring logs and well construction details will be prepared for <br />' the final written report. Figures B-1 and B-2 are examples of the <br /> Exploratory Boring Log and Well Details forms, respectively. <br /> p#V92V920201 a B - 3 Rev. 0 June 1, 1992 <br /> i <br />